I try to reproduce some videos in a sequence, this is the code, and the error message. I create the sd card in eclipse with the option Run -> Debug Configurations, is a 2GB sd card. I copied some videos to the sd card. So, I appreciate your help. Thanks.
MovieG.java
package com.example.movieg;
import java.io.File;
import android.media.MediaPlayer;
import android.media.MediaPlayer.OnCompletionListener;
import android.os.Bundle;
import android.os.Environment;
import android.os.Handler;
import android.os.Message;
import android.widget.MediaController;
import android.widget.VideoView;
import android.annotation.SuppressLint;
import android.app.Activity;
import android.util.Log;
import android.view.Menu;
public class MovieG extends Activity {
public VideoView videoView;
public String ex_name;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_movie_g);
ex_name = getIntent().getExtras().getString("video_name");
MediaController mediaController = new MediaController(this);
mediaController.setAnchorView(videoView);
videoView.setMediaController(new MediaController(this));
handler.sendEmptyMessage(1);
}
#SuppressLint("HandlerLeak")
Handler handler = new Handler(){
public void handleMessage(Message msg){
int pos=msg.what;
if (pos == 1){
File ex_name = null;
videoView.setVideoPath(Environment.getExternalStorageDirectory()+"/"+ex_name+".mp4");
videoView.requestFocus();
videoView.start();
Log.d("Before Video Finish", "i m in before video finish");
videoView.setOnCompletionListener(new OnCompletionListener() {
#Override
public void onCompletion(MediaPlayer mp) {
finish();
}
});
}
}
};
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.movie_g, menu);
return true;
}
}
AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.movieg"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="18" />
<application
android:allowBackup="true"
android:icon="#drawable/ic_launcher"
android:label="#string/app_name"
android:theme="#style/AppTheme">
<activity
android:name="com.example.movieg.MovieG"
android:label="#string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>
Error Message
02-24 21:42:54.916: D/AndroidRuntime(278): Shutting down VM
02-24 21:42:54.916: W/dalvikvm(278): threadid=1: thread exiting with uncaught exception (group=0x4001d800)
02-24 21:42:54.946: E/AndroidRuntime(278): FATAL EXCEPTION: main
02-24 21:42:54.946: E/AndroidRuntime(278): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.movieg/com.example.movieg.MovieG}: java.lang.NullPointerException
02-24 21:42:54.946: E/AndroidRuntime(278): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2663)
02-24 21:42:54.946: E/AndroidRuntime(278): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2679)
02-24 21:42:54.946: E/AndroidRuntime(278): at android.app.ActivityThread.access$2300(ActivityThread.java:125)
02-24 21:42:54.946: E/AndroidRuntime(278): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2033)
02-24 21:42:54.946: E/AndroidRuntime(278): at android.os.Handler.dispatchMessage(Handler.java:99)
02-24 21:42:54.946: E/AndroidRuntime(278): at android.os.Looper.loop(Looper.java:123)
02-24 21:42:54.946: E/AndroidRuntime(278): at android.app.ActivityThread.main(ActivityThread.java:4627)
02-24 21:42:54.946: E/AndroidRuntime(278): at java.lang.reflect.Method.invokeNative(Native Method)
02-24 21:42:54.946: E/AndroidRuntime(278): at java.lang.reflect.Method.invoke(Method.java:521)
02-24 21:42:54.946: E/AndroidRuntime(278): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
02-24 21:42:54.946: E/AndroidRuntime(278): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
02-24 21:42:54.946: E/AndroidRuntime(278): at dalvik.system.NativeStart.main(Native Method)
02-24 21:42:54.946: E/AndroidRuntime(278): Caused by: java.lang.NullPointerException
02-24 21:42:54.946: E/AndroidRuntime(278): at com.example.movieg.MovieG.onCreate(MovieG.java:28)
02-24 21:42:54.946: E/AndroidRuntime(278): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
02-24 21:42:54.946: E/AndroidRuntime(278): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2627)
02-24 21:42:54.946: E/AndroidRuntime(278): ... 11 more
You should verify that getIntent() has extras:
if (getIntent().getExtras() != null)
ex_name = getIntent().getExtras().getString("video_name");
You then need to cater for ex_name being null later in the code.
Second thing is, you never initialise videoView variable. You need to create an instance of it before it's used in onCreate().
You have not initialize the videoview:
videoView =(VideoView)findViewById(R.id.your_id);
before 28 th line
Related
I'm trying to develop a simple 2D game using libgdx in Android Studio (0.8.14), but at this point (just with a splash and an empty menu) I'm getting an error, with this LogCat output, when I launch the app (I'm testing on device, Sony Xperia Z1):
12-02 18:01:52.146 24248-24248/com.ak.thesoccerball.android D/dalvikvm﹕ Late-enabling CheckJNI
12-02 18:01:52.196 24248-24248/com.ak.thesoccerball.android W/ActivityThread﹕ Application com.ak.thesoccerball.android can be debugged on port 8100...
12-02 18:01:52.246 24248-24248/com.ak.thesoccerball.android D/dalvikvm﹕ Trying to load lib /data/app-lib/com.ak.thesoccerball.android-1/libgdx.so 0x447c06f0
12-02 18:01:52.246 24248-24248/com.ak.thesoccerball.android D/dalvikvm﹕ Added shared lib /data/app-lib/com.ak.thesoccerball.android-1/libgdx.so 0x447c06f0
12-02 18:01:52.246 24248-24248/com.ak.thesoccerball.android D/dalvikvm﹕ No JNI_OnLoad found in /data/app-lib/com.ak.thesoccerball.android-1/libgdx.so 0x447c06f0, skipping init
12-02 18:01:52.246 24248-24248/com.ak.thesoccerball.android W/dalvikvm﹕ Exception Ljava/lang/NullPointerException; thrown while initializing Lcom/ak/thesoccerball/AKGame;
12-02 18:01:52.246 24248-24248/com.ak.thesoccerball.android D/AndroidRuntime﹕ Shutting down VM
12-02 18:01:52.246 24248-24248/com.ak.thesoccerball.android W/dalvikvm﹕ threadid=1: thread exiting with uncaught exception (group=0x41618d88)
12-02 18:01:52.256 24248-24248/com.ak.thesoccerball.android E/AndroidRuntime﹕ FATAL EXCEPTION: main
Process: com.ak.thesoccerball.android, PID: 24248
java.lang.ExceptionInInitializerError
at com.ak.thesoccerball.android.AndroidLauncher.onCreate(AndroidLauncher.java:17)
at android.app.Activity.performCreate(Activity.java:5231)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2201)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2286)
at android.app.ActivityThread.access$800(ActivityThread.java:144)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1246)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:212)
at android.app.ActivityThread.main(ActivityThread.java:5135)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:877)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:693)
at dalvik.system.NativeStart.main(Native Method)
Caused by: java.lang.NullPointerException
at com.ak.thesoccerball.AKGame.<clinit>(AKGame.java:9)
at com.ak.thesoccerball.android.AndroidLauncher.onCreate(AndroidLauncher.java:17)
at android.app.Activity.performCreate(Activity.java:5231)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2201)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2286)
at android.app.ActivityThread.access$800(ActivityThread.java:144)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1246)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:212)
at android.app.ActivityThread.main(ActivityThread.java:5135)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:877)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:693)
at dalvik.system.NativeStart.main(Native Method)
The classes involved are as follows:
- AndroidLauncher.java
package com.ak.thesoccerball.android;
import android.os.Bundle;
import com.badlogic.gdx.backends.android.AndroidApplication;
import com.badlogic.gdx.backends.android.AndroidApplicationConfiguration;
import com.ak.thesoccerball.AKGame;
public class AndroidLauncher extends AndroidApplication {
#Override
protected void onCreate (Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
AndroidApplicationConfiguration config = new AndroidApplicationConfiguration();
config.useAccelerometer = false;
config.useCompass = false;
initialize(new AKGame(), config);
}
}
AKGame.java
package com.ak.thesoccerball;
import com.badlogic.gdx.Game;
import com.badlogic.gdx.Gdx;
import com.badlogic.gdx.graphics.g2d.SpriteBatch;
public class AKGame extends Game {
public static final int WIDTH = Gdx.graphics.getWidth();
public static final int HEIGHT = Gdx.graphics.getHeight();
public SpriteBatch batch;
#Override
public void create() {
batch = new SpriteBatch();
setScreen(new SplashScreen(this));
}
public void render() {
super.render(); //important!
}
public void dispose() {
batch.dispose();
}
}
And here's the AndroidManifest.xml:
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.ak.thesoccerball.android"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk android:minSdkVersion="8" android:targetSdkVersion="21" />
<uses-feature android:glEsVersion="0x00020000" android:required="true" />
<application
android:allowBackup="true"
android:icon="#drawable/ic_launcher"
android:label="#string/app_name"
android:theme="#style/GdxTheme" >
<activity
android:name="com.ak.thesoccerball.android.AndroidLauncher"
android:label="#string/app_name"
android:screenOrientation="portrait"
android:configChanges="keyboard|keyboardHidden|orientation|screenSize">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>
What am I missing so hard?
Move this code:
public static final int WIDTH = Gdx.graphics.getWidth();
public static final int HEIGHT = Gdx.graphics.getHeight();
into the create() method, for example:
#Override
public void create() {
WIDTH = Gdx.graphics.getWidth();
HEIGHT = Gdx.graphics.getHeight();
//..
}
The thing is that before the create method gets called the Gdx is still null and cannot be used yet.
I am using shared preferences to store data on whether or not a certain objective was completed for my class using a boolean shared preference. When I try and run this part of my code the logcat prints out this:
10-28 00:35:09.771: E/AndroidRuntime(429): FATAL EXCEPTION: main
10-28 00:35:09.771: E/AndroidRuntime(429): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.selectstartgo.physics281/com.selectstartgo.physics281.Grading}: java.lang.NullPointerException
10-28 00:35:09.771: E/AndroidRuntime(429): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1647)
10-28 00:35:09.771: E/AndroidRuntime(429): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1663)
10-28 00:35:09.771: E/AndroidRuntime(429): at android.app.ActivityThread.access$1500(ActivityThread.java:117)
10-28 00:35:09.771: E/AndroidRuntime(429): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:931)
10-28 00:35:09.771: E/AndroidRuntime(429): at android.os.Handler.dispatchMessage(Handler.java:99)
10-28 00:35:09.771: E/AndroidRuntime(429): at android.os.Looper.loop(Looper.java:123)
10-28 00:35:09.771: E/AndroidRuntime(429): at android.app.ActivityThread.main(ActivityThread.java:3683)
10-28 00:35:09.771: E/AndroidRuntime(429): at java.lang.reflect.Method.invokeNative(Native Method)
10-28 00:35:09.771: E/AndroidRuntime(429): at java.lang.reflect.Method.invoke(Method.java:507)
10-28 00:35:09.771: E/AndroidRuntime(429): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
10-28 00:35:09.771: E/AndroidRuntime(429): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
10-28 00:35:09.771: E/AndroidRuntime(429): at dalvik.system.NativeStart.main(Native Method)
10-28 00:35:09.771: E/AndroidRuntime(429): Caused by: java.lang.NullPointerException
10-28 00:35:09.771: E/AndroidRuntime(429): at android.preference.PreferenceManager.getDefaultSharedPreferencesName(PreferenceManager.java:353)
10-28 00:35:09.771: E/AndroidRuntime(429): at android.preference.PreferenceManager.getDefaultSharedPreferences(PreferenceManager.java:348)
10-28 00:35:09.771: E/AndroidRuntime(429): at com.selectstartgo.physics281.PhysSharedPrefs.getSharPrefBoolean(PhysSharedPrefs.java:36)
10-28 00:35:09.771: E/AndroidRuntime(429): at com.selectstartgo.physics281.Grading.findCLevel(Grading.java:270)
10-28 00:35:09.771: E/AndroidRuntime(429): at com.selectstartgo.physics281.Grading.initialize(Grading.java:24)
10-28 00:35:09.771: E/AndroidRuntime(429): at com.selectstartgo.physics281.Grading.onCreate(Grading.java:16)
10-28 00:35:09.771: E/AndroidRuntime(429): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
10-28 00:35:09.771: E/AndroidRuntime(429): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1611)
Here is my shared preference manager
package com.selectstartgo.physics281;
import android.content.Context;
import android.content.SharedPreferences;
import android.content.SharedPreferences.Editor;
import android.preference.PreferenceManager;
public class PhysSharedPrefs {
public static void putSharPrefInt(Context context, String key, int value) {
SharedPreferences pref = PreferenceManager
.getDefaultSharedPreferences(context);
Editor edit = pref.edit();
edit.putInt(key, value);
edit.commit();
}
public static void putSharPrefBoolean(Context context, String key,
boolean value) {
SharedPreferences pref = PreferenceManager
.getDefaultSharedPreferences(context);
Editor edit = pref.edit();
edit.putBoolean(key, value);
edit.commit();
}
public static int getSharPrefInt(Context context, String key, int _default) {
SharedPreferences pref = PreferenceManager
.getDefaultSharedPreferences(context);
return pref.getInt(key, _default);
}
public static boolean getSharPrefBoolean(Context context, String key,
boolean _default) {
SharedPreferences pref = PreferenceManager
.getDefaultSharedPreferences(context);
return pref.getBoolean(key, _default);
}
}
And here's a chunk of code that is not working
if (PhysSharedPrefs.getSharPrefBoolean(MyApplication.getAppContext(),
"bKey101", false))
i++;
if (PhysSharedPrefs.getSharPrefBoolean(MyApplication.getAppContext(),
"bKey102", false))
i++;
if (PhysSharedPrefs.getSharPrefBoolean(MyApplication.getAppContext(),
"bKey103", false))
i++;
if (PhysSharedPrefs.getSharPrefBoolean(MyApplication.getAppContext(),
"bKey104", false))
And my MyApplication code looks like this:
package com.selectstartgo.physics281;
import android.app.Application;
import android.content.Context;
public class MyApplication extends Application {
private static Context context;
public void onCreate() {
super.onCreate();
MyApplication.context = getApplicationContext();
}
public static Context getAppContext() {
return MyApplication.context;
}
}
Thanks for any help I can get!
Since you have made a subclass of Application, for global access to the application context, have you remembered to edit your AndroidManifest.xml?
<application
android:icon="#drawable/ic_launcher"
android:label="#string/app_name"
android:name="MyApplication"> <!-- This line -->
the error means MyApplication.getAppContext() ==null,you can check your code MyApplication
getAppContext() method ,
I posted my code below my application shows no errors int eh debug menu, when I run it logcat shows one error I posted it below. When I try to run the app on my phone it closes and stops responding and im not sure why. I was following an online tutorial and did it exactly how it said. Please help.
10-07 14:50:02.901: I/Process(11653): Sending signal. PID: 11653 SIG: 9
10-07 14:50:06.124: W/dalvikvm(11801): VFY: unable to resolve static field 1346 (MapAttrs) in Lcom/google/android/gms/R$styleable;
10-07 14:50:06.124: D/dalvikvm(11801): VFY: replacing opcode 0x62 at 0x000e
10-07 14:50:06.134: D/AndroidRuntime(11801): Shutting down VM
10-07 14:50:06.134: W/dalvikvm(11801): threadid=1: thread exiting with uncaught exception (group=0x4129bac8)
10-07 14:50:06.134: E/AndroidRuntime(11801): FATAL EXCEPTION: main
10-07 14:50:06.134: E/AndroidRuntime(11801): java.lang.NoClassDefFoundError: com.google.android.gms.R$styleable
10-07 14:50:06.134: E/AndroidRuntime(11801): at com.google.android.gms.maps.GoogleMapOptions.createFromAttributes(Unknown Source)
10-07 14:50:06.134: E/AndroidRuntime(11801): at com.google.android.gms.maps.SupportMapFragment.onInflate(Unknown Source)
10-07 14:50:06.134: E/AndroidRuntime(11801): at android.support.v4.app.FragmentActivity.onCreateView(FragmentActivity.java:284)
10-07 14:50:06.134: E/AndroidRuntime(11801): at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:682)
10-07 14:50:06.134: E/AndroidRuntime(11801): at android.view.LayoutInflater.rInflate(LayoutInflater.java:752)
10-07 14:50:06.134: E/AndroidRuntime(11801): at android.view.LayoutInflater.inflate(LayoutInflater.java:495)
10-07 14:50:06.134: E/AndroidRuntime(11801): at android.view.LayoutInflater.inflate(LayoutInflater.java:397)
10-07 14:50:06.134: E/AndroidRuntime(11801): at android.view.LayoutInflater.inflate(LayoutInflater.java:353)
10-07 14:50:06.134: E/AndroidRuntime(11801): at com.android.internal.policy.impl.PhoneWindow.setContentView(PhoneWindow.java:327)
10-07 14:50:06.134: E/AndroidRuntime(11801): at android.app.Activity.setContentView(Activity.java:1928)
10-07 14:50:06.134: E/AndroidRuntime(11801): at com.example.gloc.MainActivity.onCreate(MainActivity.java:30)
10-07 14:50:06.134: E/AndroidRuntime(11801): at android.app.Activity.performCreate(Activity.java:5250)
10-07 14:50:06.134: E/AndroidRuntime(11801): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1097)
10-07 14:50:06.134: E/AndroidRuntime(11801): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2211)
10-07 14:50:06.134: E/AndroidRuntime(11801): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2297)
10-07 14:50:06.134: E/AndroidRuntime(11801): at android.app.ActivityThread.access$700(ActivityThread.java:152)
10-07 14:50:06.134: E/AndroidRuntime(11801): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1282)
10-07 14:50:06.134: E/AndroidRuntime(11801): at android.os.Handler.dispatchMessage(Handler.java:99)
10-07 14:50:06.134: E/AndroidRuntime(11801): at android.os.Looper.loop(Looper.java:137)
10-07 14:50:06.134: E/AndroidRuntime(11801): at android.app.ActivityThread.main(ActivityThread.java:5328)
10-07 14:50:06.134: E/AndroidRuntime(11801): at java.lang.reflect.Method.invokeNative(Native Method)
10-07 14:50:06.134: E/AndroidRuntime(11801): at java.lang.reflect.Method.invoke(Method.java:511)
10-07 14:50:06.134: E/AndroidRuntime(11801): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1102)
10-07 14:50:06.134: E/AndroidRuntime(11801): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:869)
10-07 14:50:06.134: E/AndroidRuntime(11801): at dalvik.system.NativeStart.main(Native Method)
MainActivity.java
package com.example.gloc;
import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.location.Criteria;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Bundle;
import android.support.v4.app.FragmentActivity;
import android.view.Menu;
import android.widget.TextView;
import com.google.android.gms.common.ConnectionResult;
import com.google.android.gms.common.GooglePlayServicesUtil;
import com.google.android.gms.maps.CameraUpdateFactory;
import com.google.android.gms.maps.GoogleMap;
import com.google.android.gms.maps.SupportMapFragment;
import com.google.android.gms.maps.model.LatLng;
public class MainActivity extends FragmentActivity implements LocationListener {
GoogleMap googleMap;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// Getting Google Play availability status
int status = GooglePlayServicesUtil.isGooglePlayServicesAvailable(getBaseContext());
// Showing status
if(status!=ConnectionResult.SUCCESS){ // Google Play Services are not available
int requestCode = 10;
//Dialog dialog = GooglePlayServicesUtil.getErrorDialog(status, this, requestCode);
//dialog.show();
}else { // Google Play Services are available
// Getting reference to the SupportMapFragment of activity_main.xml
SupportMapFragment fm = (SupportMapFragment) getSupportFragmentManager().findFragmentById(R.id.map);
// Getting GoogleMap object from the fragment
googleMap = fm.getMap();
// Enabling MyLocation Layer of Google Map
googleMap.setMyLocationEnabled(true);
// Getting LocationManager object from System Service LOCATION_SERVICE
LocationManager locationManager = (LocationManager) getSystemService(LOCATION_SERVICE);
// Creating a criteria object to retrieve provider
Criteria criteria = new Criteria();
// Getting the name of the best provider
String provider = locationManager.getBestProvider(criteria, true);
// Getting Current Location
Location location = locationManager.getLastKnownLocation(provider);
if(location!=null){
onLocationChanged(location);
}
locationManager.requestLocationUpdates(provider, 20000, 0, this);
}
}
#Override
public void onLocationChanged(Location location) {
TextView tvLocation = (TextView) findViewById(R.id.tv_location);
// Getting latitude of the current location
double latitude = location.getLatitude();
// Getting longitude of the current location
double longitude = location.getLongitude();
// Creating a LatLng object for the current location
LatLng latLng = new LatLng(latitude, longitude);
// Showing the current location in Google Map
googleMap.moveCamera(CameraUpdateFactory.newLatLng(latLng));
// Zoom in the Google Map
googleMap.animateCamera(CameraUpdateFactory.zoomTo(15));
// Setting latitude and longitude in the TextView tv_location
tvLocation.setText("Latitude:" + latitude + ", Longitude:"+ longitude );
}
#Override
public void onProviderDisabled(String provider) {
// TODO Auto-generated method stub
}
#Override
public void onProviderEnabled(String provider) {
// TODO Auto-generated method stub
}
#Override
public void onStatusChanged(String provider, int status, Bundle extras) {
// TODO Auto-generated method stub
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
}
Layout
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity" >
<TextView
android:id="#+id/tv_location"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
<fragment xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/map"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_below="#id/tv_location"
class="com.google.android.gms.maps.SupportMapFragment" />
</RelativeLayout>
Manifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.gloc"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="12"
android:targetSdkVersion="18" />
<permission
android:name="in.wptrafficanalyzer.locationingooglemapv2.permission.MAPS_RECEIVE"
android:protectionLevel="signature"/>
<uses-permission android:name="in.wptrafficanalyzer.locationingooglemapv2.permission.MAPS_RECEIVE"/>
<uses-permission android:name="android.permission.INTERNET"/>
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
<uses-permission android:name="com.google.android.providers.gsf.permission.READ_GSERVICES"/>
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION"/>
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"/>
<uses-feature
android:glEsVersion="0x00020000"
android:required="true"/>
<application
android:allowBackup="true"
android:icon="#drawable/ic_launcher"
android:label="#string/app_name"
android:theme="#style/AppTheme" >
<meta-data
android:name="com.google.android.maps.v2.API_KEY"
android:value="IEARASEDTHSITOHIDEIT"/>
<activity
android:name="com.example.gloc.MainActivity"
android:label="#string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>
You can't change the map options in onCreate, as it has not yet been instantiated. Try doing all of the stuff in OnLocationChanged to your GoogleMap object in onResume() instead of onCreate().
I try to implement an application based on rscm (middleware). When I try to run on emulator, I get the errors listed below:
Error :03-27 16:58:20.490: E/Trace(1508): error opening trace file: No
such file or directory (2)
03-27 21:53:21.610: D/AndroidRuntime(3803): Shutting down VM 03-27
21:53:21.610: W/dalvikvm(3803): threadid=1: thread exiting with
uncaught exception (group=0x40a71930) 03-27 21:53:21.760:
E/AndroidRuntime(3803): FATAL EXCEPTION: main 03-27 21:53:21.760:
E/AndroidRuntime(3803): java.lang.RuntimeException: Unable to
instantiate activity
ComponentInfo{com.example.context_application/com.example.context_application.MyContextAwareActivity}:
java.lang.ClassNotFoundException: Didn't find class
"com.example.context_application.MyContextAwareActivity" on path:
/data/app/com.example.context_application-2.apk 03-27 21:53:21.760:
E/AndroidRuntime(3803): at
android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2106)
03-27 21:53:21.760: E/AndroidRuntime(3803): at
android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2230)
03-27 21:53:21.760: E/AndroidRuntime(3803): at
android.app.ActivityThread.access$600(ActivityThread.java:141) 03-27
21:53:21.760: E/AndroidRuntime(3803): at
android.app.ActivityThread$H.handleMessage(ActivityThread.java:1234)
03-27 21:53:21.760: E/AndroidRuntime(3803): at
android.os.Handler.dispatchMessage(Handler.java:99) 03-27
21:53:21.760: E/AndroidRuntime(3803): at
android.os.Looper.loop(Looper.java:137) 03-27 21:53:21.760:
E/AndroidRuntime(3803): at
android.app.ActivityThread.main(ActivityThread.java:5041) 03-27
21:53:21.760: E/AndroidRuntime(3803): at
java.lang.reflect.Method.invokeNative(Native Method) 03-27
21:53:21.760: E/AndroidRuntime(3803): at
java.lang.reflect.Method.invoke(Method.java:511) 03-27 21:53:21.760:
E/AndroidRuntime(3803): at
com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
03-27 21:53:21.760: E/AndroidRuntime(3803): at
com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560) 03-27
21:53:21.760: E/AndroidRuntime(3803): at
dalvik.system.NativeStart.main(Native Method) 03-27 21:53:21.760:
E/AndroidRuntime(3803): Caused by: java.lang.ClassNotFoundException:
Didn't find class
"com.example.context_application.MyContextAwareActivity" on path:
/data/app/com.example.context_application-2.apk 03-27 21:53:21.760:
E/AndroidRuntime(3803): at
dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:65)
03-27 21:53:21.760: E/AndroidRuntime(3803): at
java.lang.ClassLoader.loadClass(ClassLoader.java:501) 03-27
21:53:21.760: E/AndroidRuntime(3803): at
java.lang.ClassLoader.loadClass(ClassLoader.java:461) 03-27
21:53:21.760: E/AndroidRuntime(3803): at
android.app.Instrumentation.newActivity(Instrumentation.java:1054)
03-27 21:53:21.760: E/AndroidRuntime(3803): at
android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2097)
03-27 21:53:21.760: E/AndroidRuntime(3803): ... 11 more
Can anyone help?
package com.example.context;
import android.os.Bundle;
import android.widget.TextView;
import android.widget.Toast;
import org.aspectsense.rscm.ContextValue;
import org.aspectsense.rscm.context.client.ContextListenerActivity;
import org.json.JSONException;
import java.util.Date;
public class MyContextAwareActivity extends ContextListenerActivity
{
#Override public String[] getRequestedScopes()
{
return new String[] { "battery.level" };
}
private TextView messageTextView;
#Override protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
messageTextView = new TextView(this);
setContentView(messageTextView);
appendMessage("Activity created");
}
private void appendMessage(final String message)
{
final String currentMessage = messageTextView.getText().toString();
messageTextView.setText(currentMessage + "\n" + message);
}
#Override public void onContextValueChanged(ContextValue contextValue)
{
try
{
appendMessage(new Date() + ": The battery level is " + contextValue.getValueAsInteger() + "%");
}
catch (JSONException jsone)
{
Toast.makeText(this, "Error while displaying context event: " + contextValue, Toast.LENGTH_SHORT).show();
}
}
}
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.context"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="17" />
<uses-permission android:name="android.permission.READ_CONTACTS" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
<application
android:allowBackup="true"
android:icon="#drawable/ic_launcher"
android:label="#string/app_name"
android:theme="#style/AppTheme" >
<activity
android:name="com.example.context.MyContextAwareActivity"
android:label="#string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>
You are telling it to write to external storage. Have you set up an SD card in eclipse?
Do any of these answers help? error opening trace file: No such file or directory (2)
I've been reading up examples on how to do this, trying to piece together a functioning example from posts on this site and others. I'm sure I'm missing something small, but as a novice to Java, I could use some assistance.
I'm merely trying to create a small example, derived from the automated hello world generated when creating a new project in Eclipse. All I want to do is be able to store a few global variables in a subclass, then reference those values in my main activity. Unfortunately, every time I try to run the app, it crashes "Unfortunately, GeneralTest1 has stopped", and the log cat error is not very helpful.
Quick overview:
GlobalVars class extends Application
In the manifest, android:name has been added to reference the additional GlobalVars class
Within my main activity, I'm initializing the global vars class with getApplicationContext()
Here is everything I've got; any help would be much appreciated!
MainActivity.java
package com.example.generaltest1;
import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.widget.TextView;
public class MainActivity extends Activity {
GlobalVars myVars = ((GlobalVars)getApplicationContext());
TextView myText = (TextView) findViewById(R.id.myText);
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
myText.setText(myVars.getMyString());
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.activity_main, menu);
return true;
}
}
GlobalVars.java
package com.example.generaltest1;
import android.app.Application;
public class GlobalVars extends Application {
String myString = "Some Text";
public String getMyString() {
return myString;
}
public String setMyString(String string) {
this.myString = string;
return myString;
}
}
activity_main.xml
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent" >
<TextView
android:id="#+id/myText"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:layout_centerVertical="true"
android:text="#string/hello_world"
tools:context=".MainActivity" />
</RelativeLayout>
strings.xml
<resources>
<string name="app_name">GeneralTest1</string>
<string name="hello_world">Hello world!</string>
<string name="menu_settings">Settings</string>
<string name="title_activity_main">MainActivity</string>
</resources>
GeneralTest1 Manifest
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.generaltest1"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="15" />
<application
android:icon="#drawable/ic_launcher"
android:label="#string/app_name"
android:theme="#style/AppTheme" android:name="GlobalVars">
<activity
android:name=".MainActivity"
android:label="#string/title_activity_main" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>
Log Cat
08-14 09:53:05.546: E/Trace(620): error opening trace file: No such file or directory (2)
08-14 09:53:05.656: D/AndroidRuntime(620): Shutting down VM
08-14 09:53:05.656: W/dalvikvm(620): threadid=1: thread exiting with uncaught exception (group=0x40a13300)
08-14 09:53:05.676: E/AndroidRuntime(620): FATAL EXCEPTION: main
08-14 09:53:05.676: E/AndroidRuntime(620): java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.example.generaltest1/com.example.generaltest1.MainActivity}: java.lang.NullPointerException
08-14 09:53:05.676: E/AndroidRuntime(620): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1983)
08-14 09:53:05.676: E/AndroidRuntime(620): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2084)
08-14 09:53:05.676: E/AndroidRuntime(620): at android.app.ActivityThread.access$600(ActivityThread.java:130)
08-14 09:53:05.676: E/AndroidRuntime(620): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1195)
08-14 09:53:05.676: E/AndroidRuntime(620): at android.os.Handler.dispatchMessage(Handler.java:99)
08-14 09:53:05.676: E/AndroidRuntime(620): at android.os.Looper.loop(Looper.java:137)
08-14 09:53:05.676: E/AndroidRuntime(620): at android.app.ActivityThread.main(ActivityThread.java:4745)
08-14 09:53:05.676: E/AndroidRuntime(620): at java.lang.reflect.Method.invokeNative(Native Method)
08-14 09:53:05.676: E/AndroidRuntime(620): at java.lang.reflect.Method.invoke(Method.java:511)
08-14 09:53:05.676: E/AndroidRuntime(620): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786)
08-14 09:53:05.676: E/AndroidRuntime(620): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
08-14 09:53:05.676: E/AndroidRuntime(620): at dalvik.system.NativeStart.main(Native Method)
08-14 09:53:05.676: E/AndroidRuntime(620): Caused by: java.lang.NullPointerException
08-14 09:53:05.676: E/AndroidRuntime(620): at android.content.ContextWrapper.getApplicationContext(ContextWrapper.java:101)
08-14 09:53:05.676: E/AndroidRuntime(620): at com.example.generaltest1.MainActivity.<init>(MainActivity.java:10)
08-14 09:53:05.676: E/AndroidRuntime(620): at java.lang.Class.newInstanceImpl(Native Method)
08-14 09:53:05.676: E/AndroidRuntime(620): at java.lang.Class.newInstance(Class.java:1319)
08-14 09:53:05.676: E/AndroidRuntime(620): at android.app.Instrumentation.newActivity(Instrumentation.java:1053)
08-14 09:53:05.676: E/AndroidRuntime(620): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1974)
08-14 09:53:05.676: E/AndroidRuntime(620): ... 11 more
You are calling getApplicationContext() in your class definition, which is too early in the activity lifetime and results in a nullpointer exception. Move the assignments to your onCreate() function and it should work as expected.
Please check this article about activities and their lifecycle :
http://developer.android.com/reference/android/app/Activity.html#ActivityLifecycle
Your activity should look like this:
public class MainActivity extends Activity {
GlobalVars myVars;
TextView myText;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
myVars = ((GlobalVars)getApplication());
myText = (TextView) findViewById(R.id.myText);
myText.setText(myVars.getMyString());
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.activity_main, menu);
return true;
}
}
Add these lines in oncreate()..
GlobalVars myVars = ((GlobalVars)getApplicationContext());
TextView myText = (TextView) findViewById(R.id.myText);